There are millions of eBooks available for free on the web. Many sites allow you to access books without registering. Some sites require you to create a user account or download reader software. Listed below are a couple of free eBooks that can be viewed on the web, without a reader or user account.
Romeo and Juliet
The Adventures of Huckleberry Finn
The War of the Worlds
There are also blog sites available where you can get a review of a book before you purchase it.